IF5–pyridine–HF: air- and moisture-stable fluorination reagent
摘要:
IF5-pyridine-HF, an air- and moisture-stable solid, can be used as a fluorination reagent for the introduction of fluorine atoms to the alpha-position of the sulfur atom in sulfides. The desulfurizing-fluorination reactions of benzylic sulfides, thioacetals, and 2-(methylthio)-1,3-dithiane derivatives were also performed using this reagent. (C) 2012 Elsevier Ltd. All rights reserved.
source in the synthesis of valuable compounds. Here, we report a novel selective carboxylation of C(sp3)−F bonds with CO2 via visible-light photoredox catalysis. A variety of mono-, di-, and trifluoroalkylarenes as well as α,α-difluorocarboxylic esters and amides undergo such reactions to give important aryl acetic acids and α-fluorocarboxylic acids, including several drugs and analogs, under mild conditions
在有价值的化合物的合成中,利用二氧化碳 (CO 2 ) 作为一种无毒且可持续的 C1 来源,因其惰性而极具吸引力和挑战性。在这里,我们报告了 C(sp 3 )-F 键与 CO 2通过可见光光氧化还原催化的新型选择性羧化。各种单、二和三氟烷基芳烃以及 α,α-二氟羧酸酯和酰胺在温和条件下进行此类反应,生成重要的芳基乙酸和 α-氟羧酸,包括几种药物和类似物。值得注意的是,机械研究和 DFT 计算证明了 CO 2的双重作用在这种转变过程中作为电子载体和亲电子试剂。氟化底物将通过富电子的 CO 2自由基阴离子进行单电子还原,这些阴离子是通过连续的氢化物转移还原和氢原子转移过程从 CO 2原位生成的。我们预计我们的发现将成为使用惰性底物(包括木质素和其他生物质)进行更具挑战性的 CO 2利用率的起点。
<b>The Chemistry of Carbonyl Fluoride. I. The Fluorination of Organic Compounds</b>
作者:F. S. Fawcett、C. W. Tullock、D. D. Coffman
DOI:10.1021/ja00881a017
日期:1962.11
Carbonylfluoride is a versatile intermediate to organic fluorine compounds. Its reaction with carbonyl compounds such as cyclohexanone, benzaldehyde and benzophenone gives the gem-difluorides, while N,N-dimethylformamide yields a,a-difluorotrimethylamine. Metal fluoride-catalyzed addition at the ethylenic bond in perfluoroolefins forms perfluoroacyl fluorides, while the C--?! unsaturated compounds
Process for the production of fluorinated organic compounds and fluorinating agents
申请人:——
公开号:US20030176747A1
公开(公告)日:2003-09-18
A process for the production of a fluorinated organic compound, characterized by fluorinating an organic compound having a hydrogen atoms using IF
5
; and a novel fluorination process for fluorinating an organic compound having a hydrogen atoms by using a fluorinating agent containing IF
5
and at least one member selected from the group consisting of acids, bases, salts and additives.
Use of Trifluoromethyl Groups for Catalytic Benzylation and Alkylation with Subsequent Hydrodefluorination
作者:Jiangtao Zhu、Manuel Pérez、Christopher B. Caputo、Douglas W. Stephan
DOI:10.1002/anie.201510494
日期:2016.1.22
The electrophilic organofluorophosphonium catalyst [(C6F5)3PF][B(C6F5)4] is shown to effect benzylation or alkylation by aryl and alkyl CF3 groups with subsequenthydrodefluorination, thus resulting in a net transformation of CF3 into CH2–aryl fragments. In the case of alkyl CF3 groups, Friedel–Crafts alkylation by the difluorocarbocation proceeded without cation rearrangement, in contrast to the corresponding
亲电子性有机氟phosph催化剂[(C 6 F 5)3 PF] [B(C 6 F 5)4 ]显示出通过芳基和烷基CF 3基团进行苄基化或烷基化,随后进行加氢脱氟,从而导致CF的净转化3成CH 2-芳基片段。在烷基CF 3基团的情况下,与烷基单氟化物的相应反应相反,通过二氟碳羰基化进行的Friedel-Crafts烷基化反应没有阳离子重排。
The Difluoromethyl Group as a Masked Nucleophile: A Lewis Acid/Base Approach
作者:Jacob B. Geri、Michael M. Wade Wolfe、Nathaniel K. Szymczak
DOI:10.1021/jacs.8b06093
日期:2018.8.1
that the combination of a Brønsted superbase with a weak Lewisacid enables deprotonation of Ar-CF2H groups and capture of reactive Ar-CF2- fragments. This route provides access to isolable and reactive Ar-CF2- synthons that react with a broad array of electrophiles at room temperature. The methodology is highly general in both electrophile and difluoromethyl (hetero)arene and can be applied directly